Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..481j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 481-497. Royal Society-supported
Astronomy and Astrophysics
Astronomy
134
Astronomical Photography, Astronomical Photometry, Cosmology, Galaxies, Absorption Spectra, Instrument Errors, Photographic Plates, Sky Surveys (Astronomy), Stellar Magnitude
Scientific paper
Galaxy number-magnitude counts and color distributions are presented from objectively defined catalogs of faint galaxies on three new fields in U, b(j), r(F) and I pass-bands, determined from COSMOS machine measurements of Anglo-Australian Telescope photographs. Three further fields analyzed in a similar way in earlier papers are recalibrated and used to investigate the variation in count normalization from field-to-field. The new data define the mean faint galaxy number-magnitude relation to + or - 9 percent. The aim is to determine whether the previously observed large scatter in the faint counts is due to galaxy clustering or some other systematic effect. After a detailed assessment of contamination, absorption, and photometric and other errors, it is concluded that the observed variation in both blue and red pass-bands can be accounted for by the combination of known galaxy clustering properties and several of these small measurement errors. The trend of the galaxy counts to have steeper slopes when measured at shorter wavelengths is confirmed.
Ellis Richard S.
Fong Richard
Jones Robert L.
Peterson Bruce A.
Shanks Tom
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